this info is mostly for jordans only or other OB drivers, OB drivers need much help to produce any kind of range.Other drivers wouldnt perform well in theses type of designs
Speaker design myths revealed
I found this at the Jordan web site. Maybe the experts can say whether this is true or not. I will say I have not heard the big improvement with a narrow baffle vs. wide baffle that I am "suopposed" to.
Q: In your VTL box design, why is the JX92S fitted in the wide face when it is common knowledge that the box should be as narrow as possible?
A: 'Common knowledge' and scientific fact are often very different. The narrow front face is a fashion concept supported by some very questionable marketing rational. The indisputable scientific fact is that the ideal mounting for a loudspeaker is an infinitely large flat baffle and this is the concept used for all loudspeaker analyses. A wide baffle always sounds better.
Q: What are the recommended advantages of positioning loudspeakers as close to the wall as possible?
A: This positioning secures, to some extent, the advantages described in the previous question. In addition it minimises the time delayed reflections from the rear wall which contribute to confused imaging.
Q: Will placing next to a wall ruin the stereo image?
A: We cannot see any reason why this would impair imaging. Possibly more than any other manufacturer, we have concerned ourselves with accurate and stable imaging and certainly would not promote a design that would impair this.
Q: In your VTL box design, why is the JX92S fitted in the wide face when it is common knowledge that the box should be as narrow as possible?
A: 'Common knowledge' and scientific fact are often very different. The narrow front face is a fashion concept supported by some very questionable marketing rational. The indisputable scientific fact is that the ideal mounting for a loudspeaker is an infinitely large flat baffle and this is the concept used for all loudspeaker analyses. A wide baffle always sounds better.
Q: What are the recommended advantages of positioning loudspeakers as close to the wall as possible?
A: This positioning secures, to some extent, the advantages described in the previous question. In addition it minimises the time delayed reflections from the rear wall which contribute to confused imaging.
Q: Will placing next to a wall ruin the stereo image?
A: We cannot see any reason why this would impair imaging. Possibly more than any other manufacturer, we have concerned ourselves with accurate and stable imaging and certainly would not promote a design that would impair this.
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- 37 posts total
Johnk: "OB drivers" = open baffle drivers??? If so, disabuse yourself. There no such thing as an "open baffle driver" (although certain drive units' T/S parametres may indicate good performance on an open baffle...). Cheers Fiddler: what Twl notes above about diametres is a (unfortunate maybe) necessity. The links you give refer to ("quasi quasars") actually show baffles that should be ~0,5m wide (~20,5"). Good luck, the Phy is a beautiful unit! |
Nzera, do you have a link for Nelson Pass' comparision of the Jordan driver? I can't find it at 6moons archive |
Fiddler, basically the baffle size requirement is directly related to the bass "wraparound" cancellation that is inherent in open baffle speakers. If you use subwoofers with these systems, then the baffles can be much smaller, depending upon how high you want to cross-in the subs. For example, if you want the OB mains to only go down to 128Hz, then the quarter-wave formula would show a baffle dimension of 2' square. |
"this info is mostly for jordans only or other OB drivers, OB drivers need much help to produce any kind of range.Other drivers wouldnt perform well in theses type of designs." Johnk, if you are referring to the PHY driver, then sorry to disagree. Qt primarily determines whether a driver is suitable in OBs. The manufacturer recommends the PHY KM 30 SAG for open baffle designs. For OBs, one just has to accept a compromise between bass response vs. baffle size. With subs, baffle size options can more real-world. Thanks Twl, I am starting with a baffle about twice that size (but rectangular, not square) with the driver mounted off-center. In my earlier post, when I said smaller baffles, I didn't mean "reeeeal" small, I just meant in the four foot range with a plan to use subs crossed-over where the PHY rolls off. |
- 37 posts total